8-/16-Channel 16-Bit No Latency Delta-Sigma ADC

www.DataSheet4U.com LTC2439-1 8-/16-Channel 16-Bit No Latency ∆ΣTM ADC FEATURES s s s s s s s DESCRIPTIO s s s s s s 16-Channel Single-Ended or 8-Channel Differential Inputs Low Supply Current (200µA, 4µA in Autosleep) Rail-to-Rail Differential Input/Reference 16-Bit No Missing Codes 1µV RMS Noise, 16-ENOBS Independent of VREF Very Low Transition Noise: Less Than 0.02LSB Operates with a Reference as Low as 100mV with 1.5µV LSB Step Size Guaranteed Modulator Stability and Lock-Up Immunity for Any Input and Reference Conditions Single Supply 2.7V to 5.5V Operation Internal Oscillator—No External Components Required 87dB Min, 50Hz and 60Hz Simultaneous Notch Filter Pin Compatible with the 24-Bit LTC2418 28-Lead SSOP Package The LTC ®2439-1 is a 16-channel (8-differential) micropower 16-bit ∆Σ analog-to-digital converter. It operates from 2.7V to 5.5V and includes an integrated oscillator, 0.12LSB INL and 1µV RMS noise. It uses deltasigma technology and provides single cycle settling time for multiplexed applications. Through a single pin, the LTC2439-1 can be configured for better than 87dB differential mode rejection at 50Hz and 60Hz ±2%, or it can be driven by an external oscillator for a user-defined rejection frequency. The internal oscillator requires no external frequency setting components. The LTC2439-1 accepts any external differential reference voltage from 0.1V to VCC for flexible ratiometric and remote sensing measurement applications. It can be configured to take 8 differential channels or 16 single-ended channels. The full-scale bipolar input range is from – 0.5V REF to 0.5VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be independently set between GND and VCC. The DC common mode input rejection is better than 140dB. The LTC2439-1 communicates through a flexible 4-wire digital interface that is compatible with SPI and MICROWIRETM protocols. , LTC and LT are registered trademarks of Linear Technology Corporation. No Latency ∆Σ is a trademark of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. APPLICATIO S s s s s s s s s Direct Sensor Digitizer Weight Scales Direct Temperature Measurement Gas Analyzers Strain Gauge Transducers Instrumentation Data Acquisition Industrial Process Control TYPICAL APPLICATIO 21 CH0 22 CH1 • • • 28 CH7 1 CH8 • • • 8 CH15 10 COM REF – GND 2.7V TO 5.5V REF + VCC FO MINIMUM RESOLVABLE SIGNAL (µV) 11 9 19 1µF = EXTERNAL OSCILLATOR = 50Hz and 60Hz REJECTION THERMOCOUPLE 16-CHANNEL MUX + – DIFFERENTIAL 16-BIT ∆Σ ADC SDI SCK SDO CS 20 18 17 16 4-WIRE SPI INTERFACE 12 15 LTC2439-1 241418 TA01a U Minimum Resolvable Signal vs VREF 90 80 70 60 50 40 30 20 10 0 5 4 3 VREF (V) 24361 TA02 *FOR VREF = 0.4V RESOLUTION IS LIMITED BY STEP SIZE 1 2 0 U U 24391f 1 LTC2439-1 ABSOLUTE (Notes 1, 2) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 VCC 1 2 3 4 5 6 7 8 9 28 CH7 27 CH6 26 CH5 25 CH4 24 CH3 23 CH2 22 CH1 21 CH0 20 SDI 19 FO 18 SCK 17 SDO 16 CS 15 GND Supply Voltage (VCC) to GND .......................– 0.3V to 7V Analog Input Voltage to GND ....... – 0.3V to (VCC + 0.3V) Reference Input Voltage to GND .. – 0.3V to (VCC + 0.3V) Digital Input Voltage to GND ........ – 0.3V to (VCC + 0.3V) Digital Output Voltage to GND ..... – 0.3V to (VCC + 0.3V) Operating Temperature Range LTC2439-1C ............................................ 0°C to 70°C LTC2439-1I ........................................ – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ORDER PART NUMBER LTC2439-1CGN LTC2439-1IGN COM 10 REF+ 11 REF– 12 NC 13 NC 14 GN PACKAGE 28-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 110°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS PARAMETER Resolution (No Missing Codes) Integral Nonlinearity CONDITIONS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4) MIN q q q TYP 0.06 0.12 0.30 5 10 MAX UNITS Bits LSB LSB LSB µV nV/°C 0.1V ≤ VREF ≤ VCC, –0.5 • VREF ≤ VIN ≤ 0.5 • VREF, (Note 5) 4.5V ≤ VCC = GND, VINCM = 1.25V, (Note 6) 5V ≤ VCC ≤ 5.5V, REF+ = 5V, REF– = GND, VINCM = 2.5V, (Note 6) REF+ = 2.5V, REF– = GND, VINCM = 1.25V, (Notes 6, 15) 2.5V ≤ REF+ ≤ VCC, REF– = GND, GND ≤ IN+ = IN– ≤ VCC, (Notes 12,15) 2.5V ≤ REF+ ≤ VCC, REF– = GND, GND ≤ IN+ = IN– ≤ VCC 2.5V ≤ REF+ ≤ VCC, REF– = GND, IN+ = 0.75REF+, IN– = 0.25 • REF+ (Note 15) 2.5V ≤ REF+ ≤ VCC, REF– = GND, IN+ = 0.75REF+, IN– = 0.25 • REF+ 2.5V ≤ REF+ ≤ VCC, REF– = GND, IN+ = 0.25 • REF+, IN– = 0.75 • REF+ (Note 15) 2.5V ≤ REF+ ≤ VCC, REF– = GND, IN+ = 0.25 • REF+, IN– = 0.75 • REF+ 5V ≤ VCC ≤ 5.5V, REF+ = 2.5V, REF– = GND, VINCM = 1.25V 5V ≤ VCC ≤ 5.5V, REF+ = 5V, REF– = GND, VINCM = 2.5V REF+ = 2.5V, REF– = GND, VINCM = 1.25V, (Note 6) 5V ≤ VCC ≤ 5.5V, REF + = 5V, VREF – = GND, GND ≤ IN – = IN + ≤ 5V (Note 12) ≤ 5.5V, REF+ = 2.5V, REF– 16 1.25 20 Offset Error Offset Error Drift Positive Full-Scale Error Positive Full-Scale Error Drift Negative Full-Scale Error Negative Full-Scale Error Drift Total Unadjusted Error q 0.16 0.03 1.25 ppm of VREF/°C 1.25 LSB ppm of VREF/°C LSB LSB LSB µVRMS 24391f q 0.16 0.03 0.20 0.20 0.25 1 Output Noise 2 U LSB W U U W W W LTC2439-1 CO VERTER CHARACTERISTICS PARAMETER Input Common Mode Rejection DC Input Common Mode Rejection 49Hz to 61.2Hz Input Normal Mode Rejection 49Hz to 61.2Hz Reference Common Mode Rejection DC Power Supply Rejection, DC Power Supply Rejection, Simultaneous 50Hz/60Hz ±2% CONDITIONS 2.5V ≤ REF+ ≤ V The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4) MIN q q q q A ALOG I PUT A D REFERE CE SYMBOL IN + IN – VIN REF + REF – VREF CS (IN +) CS CS (IN –) (REF +) (IN +) (IN –) (REF –) PARAMETER Absolute/Common Mode IN + Voltage Absolute/Common Mode IN – Voltage Input Differential Voltage Range (IN + – IN –) Absolute/Common Mode REF + Voltage Absolute/Common Mode REF – Voltage Reference Differential Voltage Range (REF + – REF –) IN + Sampling Capacitance IN – Sampling Capacitance REF + Sampling Capacitance REF – Sampling Capacitance IN + DC Leakage Current IN – DC Leakage Current REF + DC Leakage Current REF – DC Leakage Current Off Channel to On Channel Isolation (RIN = 100Ω) tOPEN IS(OFF) MUX Break-Before-Make Interval Channel Off Leakage Current The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) CONDITIONS q q q q q q CS (REF –) IDC_LEAK IDC_LEAK IDC_LEAK IDC_LEAK (REF +) U U U U TYP 140 MAX UNITS dB dB dB – CC, REF = GND, – = IN+ ≤ V (Note 5) GND ≤ IN CC 2.5V ≤ REF+ ≤ VCC, REF– = GND, GND ≤ IN – = IN+ ≤ VCC, (Note 5) 130 140 87 130 (Note 5) 2.5V ≤ REF+ ≤ VCC, GND ≤ REF– ≤ 2.5V, VREF = 2.5V, IN– = IN+ = GND (Note 5) REF+ = 2.5V, REF– = GND, IN– = IN+ = GND REF+ = 2.5V, REF– = GND, IN– = IN+ = GND 140 120 120 dB dB dB U MIN GND – 0.3 GND – 0.3 – VREF/2 0.1 GND 0.1 TYP MAX VCC + 0.3 VCC + 0.3 VREF/2 VCC VCC – 0.1 VCC UNITS V V V V V V pF pF pF pF 18 18 18 18 CS = VCC CS = VCC CS = VCC = 5.5V, IN+ = 5.5V, IN– = GND = 5V q q q q –100 –100 –100 –100 1 1 1 1 140 140 140 100 100 100 100 100 nA nA nA nA dB dB dB ns CS = VCC = 5.5V, REF+ = 5V = 5.5V, REF– = GND DC 1Hz fS = 15,3600Hz 2.7V ≤ VCC ≤ 5.5V Channel at VCC and GND q –100 1 100 nA 24391f 3 LTC2439-1 DIGITAL I PUTS A D DIGITAL OUTPUTS SYMBOL VIH VIL VIH VIL IIN IIN CIN CIN VOH VOL VOH VOL IOZ PARAMETER High Level Input Voltage CS, FO, SDI Low Level Input Voltage CS, FO, SDI High Level Input Voltage SCK Low Level Input Voltage SCK Digital Input Current CS, FO, SDI Digital Input Current SCK Digital Input Capacitance CS, FO, SDI Digital Input Capacitance SCK High Level Output Voltage SDO Low Level Output Voltage SDO High Level Output Voltage SCK Low Level Output Voltage SCK Hi-Z Output Leakage SDO (Note 8) IO = – 800µA IO = 1.6mA IO = – 800µA (Note 9) IO = 1.6mA (Note 9) q q q q q The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) CONDITIONS 2.7V ≤ VCC ≤ 5.5V 2.7V ≤ VCC ≤ 3.3V 4.5V ≤ VCC ≤ 5.5V 2.7V ≤ VCC ≤ 5.5V 2.7V ≤ VCC ≤ 5.5V (Note 8) 2.7V ≤ VCC ≤ 3.3V (Note 8) 4.5V ≤ VCC ≤ 5.5V (Note 8) 2.7V ≤ VCC ≤ 5.5V (Note 8) 0V ≤ VIN ≤ VCC 0V ≤ VIN ≤ VCC (Note 8) q q q q q q POWER REQUIRE E TS SYMBOL VCC ICC PARAMETER Supply Voltage Supply Current Conversion Mode Sleep Mode Sleep Mode The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) CONDITIONS q 4 U W U U MIN 2.5 2.0 TYP MAX UNITS V V 0.8 0.6 2.5 2.0 0.8 0.6 –10 –10 10 10 VCC – 0.5 0.4 VCC – 0.5 0.4 –10 10 10 10 V V V V V V µA µA pF pF V V V V µA MIN 2.7 TYP MAX 5.5 UNITS V µA µA µA CS = 0V (Note 11) CS = VCC (Note 11) CS = VCC, 2.7V ≤ VCC ≤ 3.3V (Note 11, 14) q q 200 4 2 300 15 24391f LTC2439-1 TI I G CHARACTERISTICS SYMBOL fEOSC tHEO tLEO tCONV fISCK DISCK fESCK tLESCK tHESCK tDOUT_ISCK tDOUT_ESCK t1 t2 t3 t4 tKQMAX tKQMIN t5 t6 t7 t8 PARAMETER External Oscillator Frequency Range External Oscillator High Period External Oscillator Low Period Conversion Time Internal SCK Frequency Internal SCK Duty Cycle External SCK Frequency Range External SCK Low Period External SCK High Period Internal SCK 19-Bit Data Output Tim